| | | 1 | | using Fluorite.Strainer.Models.Filtering.Terms; |
| | | 2 | | using Fluorite.Strainer.Models.Metadata; |
| | | 3 | | using System.Linq.Expressions; |
| | | 4 | | |
| | | 5 | | namespace Fluorite.Strainer.Services.Filtering; |
| | | 6 | | |
| | | 7 | | public class FilterExpressionProvider : IFilterExpressionProvider |
| | | 8 | | { |
| | | 9 | | private readonly IFilterExpressionWorkflowBuilder _filterExpressionWorkflowBuilder; |
| | | 10 | | |
| | 8 | 11 | | public FilterExpressionProvider( |
| | 8 | 12 | | IFilterExpressionWorkflowBuilder filterExpressionWorkflowBuilder) |
| | | 13 | | { |
| | 8 | 14 | | _filterExpressionWorkflowBuilder = Guard.Against.Null(filterExpressionWorkflowBuilder); |
| | 8 | 15 | | } |
| | | 16 | | |
| | | 17 | | public Expression? GetExpression( |
| | | 18 | | IPropertyMetadata metadata, |
| | | 19 | | IFilterTerm filterTerm, |
| | | 20 | | ParameterExpression parameterExpression, |
| | | 21 | | Expression? innerExpression, |
| | | 22 | | bool isMaterializedQueryable) |
| | | 23 | | { |
| | 7 | 24 | | Guard.Against.Null(metadata); |
| | 7 | 25 | | Guard.Against.Null(filterTerm); |
| | 7 | 26 | | Guard.Against.Null(parameterExpression); |
| | | 27 | | |
| | 7 | 28 | | if (filterTerm.Values == null || !filterTerm.Values.Any()) |
| | | 29 | | { |
| | 2 | 30 | | return null; |
| | | 31 | | } |
| | | 32 | | |
| | 5 | 33 | | var nameParts = metadata.Name.Split(new[] { '.' }, StringSplitOptions.RemoveEmptyEntries); |
| | 5 | 34 | | if (!nameParts.Any()) |
| | | 35 | | { |
| | 3 | 36 | | throw new ArgumentException("Metadata name must not be empty.", nameof(metadata)); |
| | | 37 | | } |
| | | 38 | | |
| | 2 | 39 | | MemberExpression? propertyExpresssion = null; |
| | | 40 | | |
| | 8 | 41 | | foreach (var part in nameParts) |
| | | 42 | | { |
| | 2 | 43 | | propertyExpresssion = Expression.PropertyOrField((Expression?)propertyExpresssion ?? parameterExpression, pa |
| | | 44 | | } |
| | | 45 | | |
| | 2 | 46 | | return CreateInnerExpression( |
| | 2 | 47 | | metadata, |
| | 2 | 48 | | filterTerm, |
| | 2 | 49 | | innerExpression, |
| | 2 | 50 | | propertyExpresssion, |
| | 2 | 51 | | isMaterializedQueryable); |
| | | 52 | | } |
| | | 53 | | |
| | | 54 | | private Expression? CreateInnerExpression( |
| | | 55 | | IPropertyMetadata metadata, |
| | | 56 | | IFilterTerm filterTerm, |
| | | 57 | | Expression? innerExpression, |
| | | 58 | | MemberExpression? propertyExpression, |
| | | 59 | | bool isMaterializedQueryable) |
| | | 60 | | { |
| | 2 | 61 | | var workflow = _filterExpressionWorkflowBuilder.BuildDefaultWorkflow(); |
| | | 62 | | |
| | 8 | 63 | | foreach (var filterTermValue in filterTerm.Values) |
| | | 64 | | { |
| | 2 | 65 | | var context = new FilterExpressionWorkflowContext |
| | 2 | 66 | | { |
| | 2 | 67 | | FilterTermConstant = filterTermValue, |
| | 2 | 68 | | FilterTermValue = filterTermValue, |
| | 2 | 69 | | FinalExpression = null, |
| | 2 | 70 | | IsMaterializedQueryable = isMaterializedQueryable, |
| | 2 | 71 | | PropertyMetadata = metadata, |
| | 2 | 72 | | PropertyValue = propertyExpression, |
| | 2 | 73 | | Term = filterTerm, |
| | 2 | 74 | | }; |
| | | 75 | | |
| | 2 | 76 | | var expression = workflow.Run(context); |
| | | 77 | | |
| | 2 | 78 | | if (innerExpression == null) |
| | | 79 | | { |
| | 1 | 80 | | innerExpression = expression; |
| | | 81 | | } |
| | | 82 | | else |
| | | 83 | | { |
| | 1 | 84 | | innerExpression = Expression.Or(innerExpression, expression); |
| | | 85 | | } |
| | | 86 | | } |
| | | 87 | | |
| | 2 | 88 | | return innerExpression; |
| | | 89 | | } |
| | | 90 | | } |